Recyclerview inside ViewPager inside scrollview not working

Question

I have an xml layout that has following views Scrollview->RelativeLayout->Some Views + Tablayout + ViewPager->Recylerview(In Fragment of ViewPager). ViewPager has some fixed height (Keeping it "Wrap_Content" does not show it at all).Now the issue is that Recylerview never scrolls. I have tried several solutions already posted like Wraping viewpager inside "Nested Scrollview" Or Even Making Child of LinearLayout. But Nothing Worked.

Below is my xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/btn_startdraw"
        android:fillViewport="true"
        android:gravity="center">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:padding="@dimen/_5sdp">


            <TextView
                android:id="@+id/invites_accepted"
                style="@style/bodyStyleBlue"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/committee_slots"
                android:text="@string/invites_accepted" />

               <!-- A lot of other Textfields for data display-->

                <android.support.design.widget.TabLayout
                android:id="@+id/tabs_pendingcommittee"
                style="@style/TabStyle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/draw_mode_val"
                app:tabMode="fixed"></android.support.design.widget.TabLayout>b


            <com.apponative.committeeapp.ui.custom.CustomViewPager
                android:id="@+id/pending_member_view"
                android:layout_width="match_parent"
                android:layout_height="@dimen/_250sdp"
                android:layout_below="@+id/tabs_pendingcommittee"
                app:layout_behavior="@string/appbar_scrolling_view_behavior" />

        </RelativeLayout>
    </android.support.v4.widget.NestedScrollView>

    <!-- Some other views on bottom-->
</RelativeLayout>

And Fragment that Viewpager is showing has following layout xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white">

    <TextView
        style="@style/bodyStyleBold1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="No People..." />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/contact_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/title"
        android:background="@color/white"></android.support.v7.widget.RecyclerView>
</FrameLayout>

I have tried using nestedScrollingEnabled and also setFixedHeight properties on Recyclerview. But n Nothing worked.

Answer 1

I just Figured out that problem was not with RecyclerView inside ViewPager or ScrollView, but issue was with ViewPager inside ScrollView. When I put ViewPager inside ScrollView its Wrap_Content Property was not working so A fixed Height restrict RecyclerView content to fully showup. So I resolved this issue by Customizing ViewPager 's onMeasure Method and it working smoothly. No need to wrap in NestedScroll view or other given solutions.

Below is Code for my CustomView Pager that wraps content when added as child to ScrollView:

public class CustomViewPager extends ViewPager {

    boolean canSwipe = true;

    public CustomViewPager(Context context) {
        super(context);
    }

    public CustomViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        View child = getChildAt(getCurrentItem());
        if (child != null) {
            child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
            int h = child.getMeasuredHeight();
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(h, MeasureSpec.EXACTLY);
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    public void canSwipe(boolean canSwipe) {
        this.canSwipe = canSwipe;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (this.canSwipe) {
            return super.onTouchEvent(event);
        }

        return false;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        if (this.canSwipe) {
            return super.onInterceptTouchEvent(event);
        }

        return false;
    }
}